You probably won't get busted by the techs/dealer because of the catless codes, all it will take is a simple look at the undercarriage and it will be plain as day obvious that you have no primary cats. Though they'll also read the dme for faults so you're a bit screwed either way. If a dealer cares about catless downpipes (and most do), dpfix is not going to save you.

Thank you I guess it's up to the SA in this case or the actual tech uncovering this?